Equipment, system and realizing method for wireless local network transmission group broadcasting frame

Abstract

A method for transmitting multicast frame in radio local area network includes sending multicast message to radio access device by multicast source, seeking multicast member listing by radio access device and replacing multicast destination address of multicast message by MAC address of each member client end in multicast set one by one if multicast set corresponding to multicast message has multicast member client end in listing then sending said multicast message to member radio client end in multicast set by radio access device. The system used to realize said method is also disclosed.

Description

technical field [0001] The invention relates to a method for realizing multicast technology service application in wireless local area network networking in the field of wireless communication, in particular to a device, system and method for IEEE 802.11 wireless local area network (WLAN) transmission of multicast frames. Background technique [0002] As an access technology for network terminals, WLAN has the advantages of high access speed and simple wiring, and is more and more widely used in home networks. With the continuous development of broadband and video compression technologies, video and voice The demand for multimedia transmission over the network is growing rapidly. Currently more popular multimedia applications, such as real-time video and voice interaction, IPTV (Internet Protocol TV) and other applications, all require relatively high network bandwidth support, and the transmission of multimedia applications through wireless LAN technology has gradually beco...

AI Technical Summary

Problems solved by technology

When the signal quality between the wireless access point and the wireless client changes, the transmission rate of multicast packets cannot be adjusted in time between the wireless access point and the wireless client, resulting in an increase in the error rate of multicast packet transmission. The multicast frame between the wireless access point and the wireless client does not have a confirmation reception mechanism, the transmission reliability of the multicast frame is relatively low, and the playback is often not smooth, which affects the development of the business

[0009] The multicast message sent by the wireless access point is sent to all wireless clients. In order to ensure that all wireless clients can receive the multicast frame, the wireless access point usually sends the multicast frame at the most conservative data rate. , such as 802.11b is usually 1Mbps, 802.11a / g is usually 2Mbps, but the actual bandwidth is lower than the above-mentioned multicast frame data transmission rate, which is for multimedia applications such as IPTV services that require at least 2Mbps or even higher bandwidth , the bandwidth is obviously insufficient, affecting the normal development of business

If a relatively high multicast data transmission rate is fixedly configured, some wireless clients with relatively low signal quality may not be able to receive it correctly, especially when the distance between the wireless client and the wireless access point, obstacles, etc. The signal quality between the wireless client and the wireless access point changes due to the change. If the multicast transmission rate between the wireless access point and the wireless client cannot be adjusted in real time, a high multicast transmission bit error rate will occur. As a result, wireless clients cannot correctly receive multicast packets

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